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| Magenta (f) | Anilinrot (nt) | Magenta | Fucsina | Fucsina (f) | |
| Maillet (m) | Holzhammer (m) | Mallet / Wooden mallet | Mazzuolo (m) / Mazzuolo di legno (m) | Mazo (m) / Mazo de madera | |
| Maillet (m) / Marteau (m) / Mailloche (f) | Knüpfel (m) / Klipfel (m) / Klüpfel (m) / Klöpfel (m) | Mallet | Mazzuolo (m) / Maglio (m) | Mazo (m) / Martillo (m) | |
| Maillet en caoutchouc (m) | Gummihammer (m) | Rubber mallet | Martello di gomma | Mazo de caucho (m) | |
| Main courante (f) | Handlauf (m) | Handrail | Corrimano (m) | Pasamano (m) | |
| Maintenance (f) / Entretien (m) | Instandhaltung (f) / Instandhalten (nt) | Maintenance and repair / Maintenance and service / Maintenance / Servicing | Mantenimento (m) / Manutenzione (f) | Mantenimiento (m) / Mantenimiento y reparación (m) | |
| Maison à colombage (f) | Fachwerkhaus (nt) | Half-timbered house | Casa a graticcio (f) | Casa de entramado (f) | |
| Mandrin (m) | Dorn (m) | Mandrel | Spiga | Mandril (m) | |
| Manomètre (m) | Manometer (nt) / Druckmessgerät (nt) | Pressure gauge / Manometer | Manometro (m) | Manómetro (m) / Medidor de presión (m) | Medidor de pressão (m) / Manómetro (m) |
| Marbre (m) | Marmor (m) | Marble | Marmo (m) | Mármol (m) | Mármore (m) |
| Marchepied (courbe) (m) | Antrittsstufe (Geschwungene) (f) | Stair tread (curved) | Gradino a gradino (curvo) (m) | Paso a escalón (curvo) | |
| Marron d'alizarine (m) | Alizarinbraun (nt) | Alizarin (Brown) | Bruno d'alizarina (m) | Antragalol (m) | |
| Marteau (m) | Hammer (m) | Hammer | Martello (m) | Martillo (m) | |
| Marteau club (m) / Maillet (m) | Fäustel (m) | Mallet / Club hammer / Stonemason's hammer | Martello da club (m) / Mazzuolo (m) | Martillo de maza (m) / Mazo (m) | |
| Marteau perforateur (m) | Bohrhammer (m) | Rotary hammer / Hammer drill | Martello perforatore (m) | Martilla Perforador (m) | |
| Marteau à ailettes (m) | Finnhammer (m) | Fin hammer | Martello a pinna (m) | Martillo de aleta (m) | |
| Marteau-piqueuer (m) | Drucklufthammer (m) | Pneumatic hammer / Jackhammer | Martello pneumatico (m) | Martillo neumático (m) | |
| Masque antigaz (m) | Gasmaske (f) | Gas mask | Maschera antigaz (f) | Máscara de gas (f) | |
| Masque respiratoire (m) | Atemschutzmaske (f) | Dust mask | Mascherine antismog (f) | Mascarilla de protección (f) | |
| Masse atomique (f) | Atommasse (f) | Atomic mass | Massa atomica (f) | Masa atómica (f) | |
| Mastic (m) | Kitt (m) | Putty / Lute / Cement / Filler | Stucco (m) / Mastice (m) | Masilla (f) | |
| Mastic commun (m) | Fugenkitt (m) | Grout / Joint putty | Stucco per giunti | Masilla para juntas (f) | |
| Mastic pour fenêtres (m) | Fensterkitt (m) | Window putty | Stucco per finestre (m) | Masilla para ventanas (f) | |
| Matrice (f) | Matrize (f) | Die / Matrix / Template / Stencil / Mould | Matrice (f) | Matriz (f) / Molde (m) | Matriz (f) / Molde (m) |
| Matériau de moulage (m) | Abformmasse (f) | Moulding material | Pasta da modellare (f) | Masa para modelar (f) | |
| Matériau de moulage (m) | Abgussmasse (f) | Casting material | Gesso (m) | Masa para vaciado (f) | |
| Mauresque (f) | Maureske (f) | Moorish pattern / Moresque | Moresca (f) | Morisco (m) | Mauresco (m) |
| Maçonnerie (f) / Murs (m.pl) / Briquetage (m) | Mauerwerk (nt) | Masonry / Brickwork | Muratura (f) | Albañilería (f) | |
| Maître-autel (m) | Hochaltar (m) | High altar / Main altar | Altare maggiore (m) | Altar mayor (m) / Retablo mayor (m) | |
| Meneau (m) / Poteau de fenêtre (m) | Mittelpfosten (m) / Fensterpfosten (m) | Centre post / Window jamb / Mullion | Palo centrale / Palo della finestra / Montante | Poste central (m) / Poste de la ventana (m) / Parteluz (m) | |
| Meuble (m) / Meubles (m.pl) / Mobiliers (m.pl) | Möbel (nt.pl) / Mobiliar | Furniture | Mobile (m) | Mueble (m) / Muebles (m.pl) / Mobiliario (m) | Móvel (m) / Móveis (m.pl) / Mobiliário (m) / Mobília (f) |
| Mezzanine (f) | Hochparterre (nt) | Mezzanine floor | Mezzanino (m) | Entresuelo (m) | |
| Microscope binoculaire (m) | Binokularmikroskop (nt) | Binocular microscope | Microscopio biocolare (m) | Microscopio binocular (m) | |
| Minerai (m) | Erz (nt) | Ore / Metal ore | Minerale metallico (m) | Mena (f) | |
| Mini-pelle mécanique (f) | Bagger (Mini) (m) | Mini-excavator | Miniescavatore (m) | Miniexcavadora (f) | |
| Mixtion (f) | Anlegeöl (nt) | Gilding oil / Gold size | Mordente (m) | Mixtión (m) | |
| Modification (f) | Änderung (f) | Modification | Modifica (f) | Modificatión (f) | |
| Modèle (m) / Schéma (m) | Muster (nt) | Sample / Pattern / Model / Design | Campionario | Patrón (m) / Modelo (m) / Muestra (f) / Estampado (m) | Padrão (m) / Amostra (f) / Modelo (m) |
| Moitié (f) | Hälfte (f) | Half | Metà (f) | Mitad (f) | |
| Monoxyde de carbone (m) | Kohlenmonoxid (nt) / Kohlenstoffmonoxid (nt) | Carbon monoxide | Monossido di carbonio (m) | Monóxido de carbono (m) | |
| Montant (m) | Pfost (m) | Post / Upright | Montante (m) | Montante (m) | |
| Montant d'eau (m) / Perle d'égouttage (f) | Wetterschenkel (m) / Wasserschenkel (m) | Weather bead / Drip bead | Gambe dell'acqua / Perlina gocciolante | Gota de goteo (f) | |
| Monument (m) | Denkmal (nt) | Monument | Monumento (m) | Monumento (m) | |
| Mortaise et tenon à arêtes lâches (f) | Zapfenschloss (nt) | Loose-wedged mortise and tenon joint | Mortasico e tenone sciolto e giunto a tenone (m) | Unión de espiga y mortaja de cuña suelta (f) | |
| Mortier (m) | Mörtel (m) | Mortar / Grout | Malta (f) | Mortero (m) / Argamasa (f) | Argamassa (f) |
| Mortier de gypse (m) | Gipsmörtel (m) / Gipsputz (m) | Plaster / Gypsum mortar | Malta di gesso (f) / Stucco (m) | Mortero de yeso (m) / Enlucido de yeso (m) | |
| Moulage (m) | Abguss (m) | Cast/Replica | Calco (m) | Vaciado (m) | |
| Moulage concave (m) / Chanfrein (m) / Filet (m) / Gorge creuse | Hohlkehle (f) | Concave moulding/ Cavetto | Stampaggio concavo (m) / Smusso (m) / Gola cava | Moldeo cóncavo (m) / Chaflán (m) / Garganta hueca / Mediacaña | |
| Moule de coulée (m) / Moule (m) / Moulage (m) | Gussform (f) / Giessform (f) | Mould / Casting mould / Die | Stampo di colata (m) / Forma stampo da fonderia (f) | Molde de fundición (m) | |
| Mouler | Abformen (v) | Mould | Modellare | Modelar | |
| Mur chauffant (m) | Heizwand (f) | Heating panel | Parete riscaldante | Pared de calefacción (f) | |
| Mur circulaire (m) | Ringmauer (f) | Curtain wall | Muro circolare | Muro cortina (m) | |
| Mur intérieur (m) / Paroi intérieure (f) | Innenwand (f) | Interior wall / Internal wall / Inner wall | Parete interna (f) | Pared interior (f) / Pared interna (f) / Muro interior (m) | |
| Musée (m) / Muséum (m) | Museum (nt) | Museum | Museo (m) | Museo (m) | Museu (m) |
| Mutulus | Mutulus (m) | Mutulus | Mutulus | Múltulo (m) | Mutulus |
| Mécanisme de pliage (m) | Faltwerk (nt) | Folded plate/ Folded structure | Meccanismo di piegatura (m) | Mecanismo de plegado (m) | |
| Mélèze (m) | Lärche (f) | Larch | Larice (f) | Alerce (m) | Larício (m) / Lariço (m) |
| Métal (m) | Metall (nt) | Metal | Metallo (m) | Metal (m) | Metal (m) |
| Métal précieux (m) | Edelmetall (nt) | Precious metal (Noble metal) | Metallo nobile (m) | Metales preciosos (m.pl) | |
| Métaux alcalino-terreux (m.pl) | Erdalkalien (f.pl) / Erdalkalimetalle (nt.pl) | Alkaline earth metals (pl) | Metalli alcalino terrosi (m.pl) | Metales alcalinotérreos (m.pl) | |
| Métaux alcalins (m, pl) | Alkalimetalle (nt, pl) | Alkali metals | Metalli alcalini (m, pl) | Metales alcalinos (m, pl) | |
| Métier (m) / Travail du commerce (m) | Gewerk (nt) / Handwerk (nt) | Trade / Tradework / Handwork | Commercio (m) | Trabajo comercial (m) | |
| Métope (f) | Metope (f) | Metope | Metopa (f) | Métopa (f) | Metope |
| Métre pliant (m) / Règle glissante (f) | Gleidermassstab (m) / Zollstock (m) / Meterstab (m) | Folding yardstick / Folding ruler | Metro pieghevole (m) / Regola scorrevole | Metro plegable (m) / Regla deslizante (f) | |
| Métré (m) | Aufmaß (n) | Measurement (of construction) | Misurazione di construzione (m) | Mediciòn (f) | |
| m) , Bouleau (m) (Bois de bouleau | Birke (f) / Birkenholz (nt) | Birch | Betulla (Legno di betulla, m) | Abedul (m) (Madera de abedul, f) | |
| maillet | Schlägel | mallet / sledgehammer | mazza / martello di legno | mazo | |
| marqueté | eingelegt (adj) | inlaid | intarsiato | inserto | |
| marteler | hämmern (v) | hammer | martellare | martillar | |
| massif (adj) | massiv (adj) | solid (adj) / massive (adj) | massicciamente (adj) / massiccio (adj) | macizo (adj) | maciço (adj) / sólido (adj) |
| mobile, Rail de guidage | Führungsschiene, beweglich (f) | Guide rail, movable | Rotaia di guida, mobile | Carril guía, móvil (m) | |
| modifier | ändern (etwas) (v) | modify | modificare | modificar | |
| montant de porte | Türpfosten | doorpost | stipite porta | jamba puerta | |
| mouiller | anfeuchten (v) | moisten | inumidire | humedecer | |
| moulure, liston | Schlagleiste | baffle plate | listello | franja | |